US3708453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear segmented polyurethanes
Assignee: Bayer AG
•
Filing: 1970-10-09
•
Granted: 1973-01-02
•
Expires: 1990-10-09
Abstract
Abstract LINEAR SEFMENTED POLYURETHANES CONTAINING CHAIN EXTENDING SEGMENTS DERIVED FROM MONOUREADIHYDRAZIDES AND A PROCESS FOR THEIR PRODUCTION. THE POLYURETHANES ARE USEFUL IN THE PRODUCTION OF ELASTOMERIC FILAMENTS.
Inventors
- 👤 W Thoma
- 👤 H Oertel
- 👤 H Rinke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:33
CPC Classifications
C; C07; C07C; C07C243/00; C07C275/00; C07C275/04; C07C275/06; C07C275/16; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0804; C08G18/0809; C08G18/0814; C08G18/10; C08G18/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |